首页
登录
职称英语
After going over some basic about hearing, the teacher will lead the students to
After going over some basic about hearing, the teacher will lead the students to
游客
2023-11-10
43
管理
问题
After going over some basic about hearing, the teacher will lead the students to
I’m glad to see so many of you here. We’ve become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss. (7) First, I want to go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. (8) The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. (9) Sounds up to 80 decibels generally aren’t harmful. That’s noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. (10) Once you are up to around 140 decibels, that’s like a jet plane taking off, then you might even feel pain in your ears. And pains are sure sign that your hearing’s at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let’s try to generate a list of damaging noises.
选项
A、put the theory learned into practice.
B、finish and check their homework.
C、solve some academic problems.
D、cure people who are experiencing hearing loss.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3173506.html
相关试题推荐
Howmanystudentsreceivedanadmissione-mailfromtheUniversityofCalifornia
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
Teachersneedtobeawareoftheemotional,intellectual,andphysicalcha
随机试题
DuringMcDonald’searlyyearsFrenchfriesweremadefromscratcheveryday.
It______snowtomorrow,buttheywillclimbthemountain.A、mustB、mayC、canD、cou
FirstAidforAnimalBitesRisksofBitesThemostc
某单位在当地行使环境监督管理权的部门现场检查时弄虚作假.情节恶劣,则有关部门应该
下列句子中,加点的成语使用不恰当的一项是()。
欲称取0.1g药物,按规定其相对误差不超过±10%,选用天平的分度值为A:0.2
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
塑钢是铝合金的可替代商品,根据塑钢的销售量,可大体预测铝合金的需求变化。这种预测
下列选项中,对“丝绸之路”有关的表述,不正确的是( )。A.货物中丝绸品影响最
根据禁毒部门的要求,社会工作者需要排查机构服务辖区内登记在册的吸毒人员,社会工作
最新回复
(
0
)